Build (method = -2) #dp: 1276 Step-3' Graph: 178 vertices and 542 arcs (0.01s) Step-4' Graph: 64 vertices and 314 arcs (0.01s) #V4/#V3 = 0.36 #A4/#A3 = 0.58 Ready! (0.01s) Optimize a model with 114 rows, 315 columns and 821 nonzeros Presolve removed 48 rows and 58 columns Presolve time: 0.00s Presolved: 66 rows, 257 columns, 624 nonzeros Variable types: 0 continuous, 257 integer (213 binary) Found heuristic solution: objective 33.0000000 Found heuristic solution: objective 31.0000000 Optimize a model with 66 rows, 257 columns and 624 nonzeros Presolved: 66 rows, 257 columns, 624 nonzeros Root barrier log... Ordering time: 0.00s Barrier statistics: AA' NZ : 2.640e+02 Factor NZ : 1.173e+03 Factor Ops : 2.436e+04 (less than 1 second per iteration) Threads : 1 Objective Residual Iter Primal Dual Primal Dual Compl Time 0 8.38594308e+01 -2.27101170e+02 3.94e+02 3.05e-01 3.24e+00 0s 1 5.79131169e+01 -7.87882140e+01 3.15e+01 4.44e-16 4.50e-01 0s 2 3.39112798e+01 3.71615806e+00 8.29e-01 4.44e-16 6.16e-02 0s 3 2.74567129e+01 2.18816416e+01 3.09e-02 2.64e-16 1.09e-02 0s 4 2.57878664e+01 2.46950772e+01 3.78e-03 2.76e-16 2.13e-03 0s 5 2.55436207e+01 2.50184129e+01 6.17e-04 2.22e-16 1.02e-03 0s 6 2.55059977e+01 2.54918402e+01 3.99e-05 3.33e-16 2.76e-05 0s 7 2.55000005e+01 2.54999957e+01 3.72e-09 2.27e-16 9.23e-09 0s 8 2.55000000e+01 2.55000000e+01 1.27e-14 4.44e-16 9.23e-12 0s Barrier solved model in 8 iterations and 0.00 seconds Optimal objective 2.55000000e+01 Root relaxation: objective 2.550000e+01, 103 iterations, 0.00 seconds Nodes | Current Node | Objective Bounds | Work Expl Unexpl | Obj Depth IntInf | Incumbent BestBd Gap | It/Node Time 0 0 25.50000 0 7 31.00000 25.50000 17.7% - 0s H 0 0 26.0000000 25.50000 1.92% - 0s Explored 0 nodes (192 simplex iterations) in 0.01 seconds Thread count was 1 (of 8 available processors) Optimal solution found (tolerance 0.00e+00) Best objective 2.600000000000e+01, best bound 2.600000000000e+01, gap 0.0% Preprocessing time: 0.01 seconds Gurobi run time: 0.01 seconds Total run time: 0.03 seconds Objective: 26 Solution: 1 x [9, 44] 1 x [16, 48] 1 x [47] 1 x [2, 46] 1 x [8, 43] 1 x [17, 49] 1 x [7, 21] 1 x [36, 38] 1 x [3, 39] 1 x [32, 37] 1 x [10, 27] 1 x [18, 50] 1 x [6] 1 x [4, 40] 1 x [11, 20] 1 x [29, 45] 1 x [1, 34] 1 x [19, 41] 1 x [12, 14] 1 x [15, 33] 1 x [13, 22] 1 x [30, 35] 1 x [5, 31] 1 x [24, 42] 1 x [26, 28] 1 x [23, 25]